Annual water heater maintenance is the single action that most consistently extends unit lifespan in Triangle homes. Jordan Lake and Falls Lake municipal water carries dissolved calcium and magnesium that precipitate as scale when heated. On a tank unit that builds as sediment at the tank bottom. On a tankless unit it restricts flow through the heat exchanger. Both failures are preventable with annual service.
Tank Water Heater Maintenance
Sediment Flush
Flushing removes the mineral layer at the tank bottom that reduces efficiency, forces longer element cycles, and generates rumbling sounds. In Triangle homes on untreated municipal supply, a water heater unflushed for three or more years carries a sediment load that is costing money every month. Annual flushing prevents the efficiency loss and the tank damage that leads to premature replacement. See Water Heater Sediment Flush for the full process.
Anode Rod Inspection and Replacement
The sacrificial anode rod corrodes in place of the steel tank shell. When it depletes, the tank starts corroding from the inside. Most anode rods last 3 to 5 years in Triangle water. Annual inspection catches depletion early. See Anode Rod Replacement.
Tankless Water Heater Maintenance
The tankless equivalent of a sediment flush is an annual heat exchanger descale. A food-grade descaling solution is circulated through the heat exchanger for 45 minutes, dissolving calcium carbonate scale. On a Navien or Rinnai in Triangle water without a softener, annual descaling is what separates a unit that lasts 18 years from one that needs a heat exchanger replacement at year 8. Orange County water (Chapel Hill, Carrboro, Hillsborough) runs slightly harder than Durham municipal supply — making descaling even more critical for those installations.
What a Maintenance Visit Includes
- Sediment flush (tank) or heat exchanger descale (tankless)
- Anode rod inspection and replacement if depleted
- T&P relief valve test
- Inlet strainer screen cleaning (tankless)
- Visual inspection of connections, venting, and combustion air
- Temperature calibration check
- Written condition report with recommended next steps
Related Services
- Tank Water Heater Repair
- Tankless Water Heater Repair
- Water Heater Replacement
- Water Heater Services Overview